/*!	 insideout.cpp
**	 Implementation of the "Inside Out" layer
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007 Chris Moore
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
** === N O T E S ===========================================================
**
** ========================================================================= */

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include "insideout.h"

#include <synfig/localization.h>
#include <synfig/general.h>

#include <synfig/string.h>
#include <synfig/time.h>
#include <synfig/context.h>
#include <synfig/paramdesc.h>
#include <synfig/renddesc.h>
#include <synfig/surface.h>
#include <synfig/value.h>
#include <synfig/valuenode.h>
#include <synfig/transform.h>

#endif

using namespace std;
using namespace etl;
using namespace synfig;
using namespace modules;
using namespace lyr_std;

SYNFIG_LAYER_INIT(InsideOut);
SYNFIG_LAYER_SET_NAME(InsideOut, "inside_out");
SYNFIG_LAYER_SET_LOCAL_NAME(InsideOut, N_("Inside Out"));
SYNFIG_LAYER_SET_CATEGORY(InsideOut, N_("Distortions"));
SYNFIG_LAYER_SET_VERSION(InsideOut, "0.1");
SYNFIG_LAYER_SET_CVS_ID(InsideOut, "$Id$");

InsideOut::InsideOut():
    param_origin(ValueBase(Point(0, 0)))
{
    SET_INTERPOLATION_DEFAULTS();
    SET_STATIC_DEFAULTS();
}

bool
InsideOut::set_param(const String & param, const ValueBase &value)
{
    IMPORT_VALUE(param_origin);
    return false;
}

ValueBase
InsideOut::get_param(const String & param)const
{
    EXPORT_VALUE(param_origin);

    EXPORT_NAME();
    EXPORT_VERSION();

    return ValueBase();
}

Layer::Handle
InsideOut::hit_check(Context context, const Point &p)const
{
    Point origin = param_origin.get(Point());
    Point pos(p - origin);
    Real inv_mag = pos.inv_mag();
    Point invpos(pos * inv_mag * inv_mag);
    return context.hit_check(invpos + origin);
}

RendDesc
InsideOut::get_sub_renddesc_vfunc(const RendDesc &renddesc) const
{
    RendDesc desc(renddesc);
    desc.set_wh(512, 512);
    desc.set_tl(Vector(-5.0, -5.0));
    desc.set_br(Vector(5.0,  5.0));
    return desc;
}

Color
InsideOut::get_color(Context context, const Point &p)const
{
    Point origin = param_origin.get(Point());
    Point pos(p - origin);
    Real inv_mag = pos.inv_mag();
    Point invpos(pos * inv_mag * inv_mag);
    return context.get_color(invpos + origin);
}

CairoColor
InsideOut::get_cairocolor(Context context, const Point &p)const
{
    Point origin = param_origin.get(Point());
    Point pos(p - origin);
    Real inv_mag = pos.inv_mag();
    Point invpos(pos * inv_mag * inv_mag);
    return context.get_cairocolor(invpos + origin);
}

class lyr_std::InsideOut_Trans : public Transform
{
    etl::handle<const InsideOut> layer;
public:
    InsideOut_Trans(const InsideOut* x): Transform(x->get_guid()), layer(x) { }

    Vector perform(const Vector& x)const
    {
        Point origin = layer->param_origin.get(Point());
        Point pos(x - origin);
        Real inv_mag = pos.inv_mag();

        if (!std::isnan(inv_mag)) {
            return (pos * (inv_mag * inv_mag) + origin);
        }

        return x;
    }

    Vector unperform(const Vector& x)const
    {
        Point origin = layer->param_origin.get(Point());
        Point pos(x - origin);
        Real inv_mag = pos.inv_mag();

        if (!std::isnan(inv_mag)) {
            return (pos * (inv_mag * inv_mag) + origin);
        }

        return x;
    }

    String get_string()const
    {
        return "insideout";
    }
};
etl::handle<Transform>
InsideOut::get_transform()const
{
    return new InsideOut_Trans(this);
}

Layer::Vocab
InsideOut::get_param_vocab()const
{
    Layer::Vocab ret;

    ret.push_back(ParamDesc("origin")
                  .set_local_name(_("Origin"))
                  .set_description(_("Defines where the center will be"))
                 );

    return ret;
}